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Full text of "The manufacture and properties of iron and steel"

METALLURGY OF IRON AND STEEL.
melted iron added to it. Taking the case of a 50-ton furnace and assuming that thirty tons of low-carbon metal is retained and twenty tons of pig-iron added, the average of the new bath will contain about 1.5 per cent, of carbon, which, will be quite a manageable mixture.
Considerable stress is laid on the addition of iron oxide before the addition of pig-iron in order to create a violent reaction and quickly oxidize the metalloids, and it is claimed by Mr. Talbot that this oxidation produces heat. It will be shown in Section Xlle that this is a great mistake and that the reaction absorbs much energy. Were it not so, there would be no difficulty in eliminating
TABLE XII-D. Reactions in the Talbot Process.
Note:   For convenience I have started both heats at 12:00 o'clock.
Time.	Sample.	Weight Ibs.	Composition of Metal.					Composition of Slag.			
			C	3	P	Mn	Si	Fe	SiO,	P.O.	MnO
12:00 12:30 1:05 1:10 1:18 1:20 1:20 1:35 1:40 1:47 1:50 1:50 3:30 3:30 3:40 4:30 4:35 4:40 4:40 12:00 12:40 1:10 1:15 1:25 1:40 1:45 2:00 2:05 2:05 3:50 4:35 4:40 4:50 4:55	Heat No. 254 Slag from previous heat.							10.49	11.68	13.26	7.00
		8,eoo									
	Bath and slag. .. ......... Cupola Iron .............. Bath and slag ...........	90,000 23,700 113,700 2,200 1,440	0.06 3.80 0.49	.051 .082 .053	.026 1.012 0.132	0.08 0.26 0.15	6!is	25.57 'ii'.87	8.68 '12'. 16	9.44 'ie'.is	 .....
											
	Bath and Blag. ...........	113,700 12,000 125,700 2,500 2250	0.38 3.80 0.71	.056 .065 .057	0.111 0.980 0.144	0.14 0.43 0.14	6."25	10.39	12.62	17.05	
	Cupola Iron.... . .........										
								10.71	12.32	15.56	......
											
											
		1,100 1,000 800 125,700 3,000 128,700									
	Limestone .... ...........										
											
			0.07 3.80 0.11 0.16	.025 .065 .033 .050	0.085 0.980 0.041 0.036	0.17 0.43 0.18 0.50	6^25	13.95	......	......	......
	Cupola Iron ...... . .......										
								11.59 11.81 14.29 '43'.37 'sd'.i? 23.16 'is'.os	'ii'.ss 11.70 "6.16 'il'.22 9.95 'ii'.os	"ii'.os 12.03 "i'.i? 10.82 9.83 '12.45	"f.SS 5.12
	Steel and Blag- tapped. . . . Heat No. 806-Slag from previous heat. Scale ..................... Bath and slag ............ Cupola Iron....... .......										
		3,800 95,000 14,000 109,000 109,000 17,200 126,200 2.300 2,700 400 126.200 6,100 132,300	'.'6e 3.80 0.11 0.07 3.80 0.34	.'053 .052 .052 .057 .057 .052	o'.ois' 0.976 0.062 0.049 1.004 0.111	6.06 0.24 0.06 0.05 0.26 0.08	oise 0.35				
	Bath and slag ............ Cupola iron. ............. Bath andsli.'2.... ........										
											
	Manganese ore- ... .......										
	Bath and tlag.. .......... Cupola Iron ..............		0.07 3.80 0.07 0.14	.049 .057 .047 .050	0.022 1.004 0.030 0.038	0.08 0.26 0.10 0.45	o'.S5	21.54 'ii>'.28 18.39	'l6!94	'l2'. 26	"5.44
	Steel and slag tapped. . . .